easyMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an IPv4 Access Control Lists issue:
R1# show access-lists 120
Extended IP access list 120
10 permit tcp 192.168.1.0 0.0.0.255 any eq 80
20 permit tcp 192.168.2.0 0.0.0.255 any eq 443
30 deny ip any any logWhat does this output indicate?
⚠ Common exam trap
Cisco often tests the ability to read ACL output precisely, and the trap here is that candidates may overlook the specific port restrictions (eq 80 and eq 443) and assume the ACL permits all traffic from the source networks, or misinterpret the 'log' keyword as affecting the permit/deny action.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ACL permits HTTP traffic from 192.168.1.0/24 and HTTPS traffic from 192.168.2.0/24, and denies all other traffic with logging.
The output shows an extended ACL with two permit statements: the first permits TCP traffic from 192.168.1.0/24 to any destination on port 80 (HTTP), and the second permits TCP traffic from 192.168.2.0/24 to any destination on port 443 (HTTPS). The final deny ip any any log statement explicitly denies all other IP traffic and logs matches, which is standard practice for ACL troubleshooting. Therefore, option A correctly describes the ACL's behavior.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The ACL permits HTTP traffic from 192.168.1.0/24 and HTTPS traffic from 192.168.2.0/24, and denies all other traffic with logging.
Why this is correct
The ACL entries match this description.
- ✗
The ACL permits all traffic from 192.168.1.0/24 and 192.168.2.0/24.
Why it's wrong here
Only specific ports are permitted.
- ✗
The ACL denies all traffic from 192.168.1.0/24 and 192.168.2.0/24.
Why it's wrong here
Those networks are permitted.
- ✗
The ACL is applied inbound on an interface and is blocking all traffic.
Why it's wrong here
The ACL permits some traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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